@@ ROWCOUNT返回0

Question

我想知道有多少行獲得與此查詢：

Using ConLoad As SqlConnection = New SqlConnection(constring) 
    Dim Query As String = "SELECT @@ROWCOUNT AS ROWnum, * FROM Specifications") 

    ConLoad.Open() 
    Using cmd As SqlCommand = New SqlCommand(Query, ConLoad) 
     Response.Write(cmd.ExecuteScalar) 
    End Using 
End Using 

在SQL Server Management Studio中執行該查詢返回38，但在我的網頁表單它返回0 。

我改進，推出了兩遍：

Using ConLoad As SqlConnection = New SqlConnection(constring) 
    Dim Query As String = "SELECT @@ROWCOUNT AS ROWnum, * FROM Specifications") 

    ConLoad.Open() 
    Using cmd As SqlCommand = New SqlCommand(Query, ConLoad) 
     Response.Write(cmd.ExecuteScalar) 
    End Using 
    Using cmd2 As SqlCommand = New SqlCommand(Query, ConLoad) 
     Response.Write(cmd2.ExecuteScalar) 
    End Using 
End Using 

而上cmd2.ExecuteScalar結果是38

我該如何做才能在第一時間取得好成績？

Answer 1

@@ROWCOUNT填充作爲查詢，在查詢中未使用的結果，你可以使用COUNT(*)：

SELECT COUNT(*) 
FROM Specifications 

或者：

SELECT * 
FROM Specifications 
PRINT @@ROWCOUNT 

Answer 2

從documentation：

@@ ROWCOUNT返回用於確定結果的數量，受最後聲明的行數..

一般COUNT(*)其中結果集本身並不需要。